Apparatus for detecting marks on a magnetic tape which identify

Details Apparatus for detecting marks on a magnetic tape which identify Apparatus for detecting marks on a magnetic tape which identify

1990-05-22

1992-03-31

Wolff, John H.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the record

360 70, 360 71, G11B 1518

Patent

active

051013029

ABSTRACT:
The information signals recorded on a magnetic tape are accompanied by marks identifying particular items of such information, each mark (M.sub.1) comprising at least one marking signal (S.sub.1), the tape being driven by a tape-up reel hub (5) during recording. During playback a magnetic head (19) reproduces the recorded signals and a tachometer (46) coupled to the take-up reel hub (5) supplies a tacho-signal which is used by a microprocessor (42) as a reference for frequency comparison with the instantaneous frequency of the reproduced signals. When a predetermined relational condition exists between such frequencies the microprocessor (42) produces a signal indicating the presence of a mark (M.sub.1). Since the frequency of the tacho-signal and the frequency of the reproduced signals from the tape are affected in the same way by variations in speed of the take-up reel hub, such variations do not affect accurate detection of the recording marks.

REFERENCES:
patent: 4120006 (1978-10-01), Nagami et al.
patent: 4151566 (1979-04-01), Ohrman
patent: 4422111 (1983-12-01), Moeller et al.
patent: 4692819 (1987-09-01), Steele
patent: 4887172 (1989-12-01), Steele

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